It looks like the Seagate Barracuda 7200.11 hard drive series is having serious problems Zune…
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Seagate's got a support page setup now where you can check if you've gotta one of the susceptible-to-death drives and download the firmware update that'll supposedly innoculate it against the brickage. If your drive is already borked, you get to the go through the fun support process to get your free data recovery—the screwy firmware doesn't actually kill the data on the drive, so Seagate should be able to get it back, no problem.